NENIR240B 2 in x 2 in Unmounted NIR Absorptive ND Filter; OD 4.0

The NENIR240B is a 2 in x 2 in Unmounted Neutral Density (ND) Filter, specifically designed for Near-Infrared (NIR) applications with a center wavelength of 1550 nm. This filter is sourced from Thorlabs, a reputable vendor known for its high-quality optical components.

The filter boasts a unique coating on both the front and back surfaces, denoted as 'tho nenir40b'. This coating is responsible for the filter's primary function, which is to reduce the intensity of incident light without altering its color composition. The NENIR240B offers an Optical Density (OD) of 4.0, indicating a significant 100,000-fold reduction in transmittance.

In terms of physical dimensions, the filter measures 50.8 mm in width and height, making it suitable for a variety of optical systems. It has a thickness of 2.6 mm, which is considered 'thin' in the context of optical components. This thinness can be beneficial in maintaining a compact system design.

The filter's geometry and shape are also noteworthy. It features a rectangular base shape and a Thin Lens shape, which can be advantageous in certain optical configurations. The filter is unmounted, providing users with the flexibility to integrate it into their systems as needed.

According to the vendor's website, the NENIR240B is currently in stock, and the weblink provided leads directly to the product page for easy access and further information.